Harmony-box for talking-machines



B. SCRIVANLI HARMONY BOX FOR TALKING MACHINES. APPLICATION FILED APR.17, 1920.

1 373 677. Patented Apr. 5, 1921.

2 SHEETSSHEET B. SCRIVANI.

HARMONY BOX FOR TALKING MACHINES. APPLICATION FILED APR. 17, I920.1,3575%677, Patented Apr. 5, 1921.

2 SHEETSSHEET 2L '02? 5 $8435 Mia 3f @icrwm IJZQL/W UNITED STATESIBENEDIGKT SCRIVANI, OF CAMDEN, TATEXV JEBZ E'Z.

HARMQYeTY-B-X FOB TALKING-MAGEIIIEJS.

- county of Camden and btate of New Jersey,

have invented new and useful Improvements in Harmony-Boxes forTalking-Machines, of which the following is a specification.

My invention relates to new and useful improvements in harmony boxes fortalkin machines, and has for its object to provide an exceedingly simpleand effective device of this description. of compact and durableconstruction, particularly adapted for use in talking machines and whichwill obviate hollow and other objectionable effects while increasing thesonority, mellowness and other good qualities in sounds.

Another object of the invention is to provide a duplex amplifier havingsounding board. tongues therein arcuate in longitudinal cross section.

A further object of the invention is to provide a longitudinally arcuatesounding board forming one of the inclosi'ng walls of the resonatorcompartment and to arrange within said compartment a longitudinallyarcuate sounding board tongue or intermediate sounding board of lesslength than the first mentioned sounding board, both of the soundingboards increasing in width toward the outlet end of the harmony box.

A still further object of the invention is to construct a harmony box sothat the sound waves emanating from the sound box and tone arm will bedivided and conveyed in opposite directions through the duplex amplifiercompartments, these divided sound waves being further divided during aportion of their travel through the compartments.

\Vith these ends in view, this invention consists in the details ofconstruction and combination of elements hereinafter set forth and thenspecifically designated by the claim.

In order that those skilled in the art to which this inventionappertains may understand how to make and use the same, I will describeits construction in detail, referring by numerals to the accompanyingdrawings forming a part of this application, in

' which Specification of Letters Patent.

an outlet opening 11 one of wl Application filed April 17, 1920. SerialNo. 274,572.

Figure harmony l1 illustrate the inerio showing the connection tone aiFig. 2, is a longitudinal section thereof with a part oi the tone armshown in elevation.

Fig. 3, is a section at line of Fig. 2. Fig. 4, is a plan view or"slip). 1 inodie5 lied form of my inve on havn section of the top wallbrok 1 away.

Fig. 5, is a longir dinal section ereof with a portion of the tone armin ion, and 2'6- Fig. 6, is a section at the line 5-6 of Fi 5.

in carrying out my invention. as here our bodied, it will be obviousthat the box may be attached to the tallzi cabinet in any Well known ora ner, and this harmony her; side walls 2 and the ends or ably convergeoutwardly. are formed of. thin boards. of these sides between sa-i theend walls a and 5 wl wardly from thei lower e s shown in Fig. O the topor these sif. and ends is placed the top or u, having an inlet open 7 mia its len th so as to communicate wi compartments 8 and 9 separate.other by a vertical 1) tween the side waiis a the entire height oi saidside walls said partition bisecting the hole '7 of the harmony box. ineach end of the top 6 formed --h leads from each compartment 8 and andthese openings 11 may be surrounded by a flange 12 secured to the top 6and projecting wardly therefrom.

Within each compartment are arranged two ver .l or a; right flat soun Crboards 13 and a which are connected to tion 10 the side walls I and 3 aa the inner ends of said fiat sou rung boards being connected with theii) at points on either side of the ails 15 other. Said sounding thelength of 4 nected to the side walls at a point approximately inalinement with the inner edge of the opening 11.

Within each compartment 8 and 9 is also located a sounding board arcuatelongitudinally which also acts as the lower inclosing wall, one end ofsaid sounding board being connected to the partition 10 and the otherend to one of the end walls while the edges diverge from the partition10 outwardly'to a point approximately midway the length thereof or for adistance equal to the fiat sounding boards 13 which point the edges ofthe are parallel to each boards 15 are connected to the fiat soundingboards 13 and 14 and to the side walls 2 and 3 along their and 14 fromarcuate sounding board edges in any suitable manner as by gluing.

them.

and 14 is mounted a sounding board I tongue 16 which is alsolongitudinally arour and of the contact nating in said sound box will bethrough the tone arm 18 to the ate and the side edges of which divergefrom their inner ends outwardly. The inner end sounding board tongueterminates in with thetop 6 while the outer end or e e is free andterminates in proximity to the inner edge of the outlet opening, but

"is spaced some distance from said opening.

The sounding board tongue is also spaced some distance from the soimdingboard 15, has a semi-circular notch 17 formed in its inner end to permitsome of the sound waves passing through the harmony box to pass abovethe sounding board tongue in their travel toward the outlet 11.

The ordinary tone arm 18 is connected with the harmony box in the regionof the inletopening 7 in any well known or approved manner and as thesound box is carried by the tbne arm the sound waves emaconverged harmonbox, said'sound waves will be divided by the partition 10 and enter bothof the compartments 8 and 9 .and as the sound waves enter saidcompartments they will be further divided, some passing above the soundboard tongue 16 and some below the same in their travel toward theoutlets 11.

In Figs. 4, 5, and 6 I have shown a slightly modified form of myinvention wherein the side walls are designated by the numerals 2 and 3,the end walls by 4 and 5, and the top by a numeral 6. .Said'top' hasa'single inlet opening 7 at one end thereof and an outlet o 'ening 11'at the opposite end, said outlet opening being surrounded by a flange12'. "Within the compartment 8 formed by said side and end walls and topare located the vertical flat sounding boards 13 and 14' one endof eachbeing situated transversel on either side of the inlet opening 5'Between the vertical flat sounding boards ture the wall here A soundingboard l5 -longitudinally ar-v cuate is arranged between the flatsounding boards 13 or with their longitudinal edges, which divergetoward the outlet opening are attached, to theflat sounding boards,while the ends of said sounding boards 15' are attached to the end walls4' and 5' said sounding board forming one of the inclosing walls of theresonator compartment 8.

Within this compartment between the flat sounding boards 13 and 14: islocated the sounding board tongue 16 longitudinally arcuate and runningfrom a point in the region of the inlet opening 7 to a point adjacentthe outlet opening 11 and at the end of this sounding board tongueadjacent the inlet is formed the semi-circular notch 17" forming apassageway. ing two spaces above tongue.

'In the same manner as for my preferred form the tone arm from theinlet. opensaid sounding board 18 is connected with the inlet of theharmony box so that the sound waves passing through said tone arm willenter the resonator compartment and pass through the same both above andbelow the sound board tongue in their travel to the outlet opening 11.

lVhen in use this harmony box is preferably placed in the motorcompartment of a talking machine cabinet with the top wall thereof inline with the top wall of the cabinet being supported by the back sidesof said compartment.

In actual practice harmony box constructed in accordance with thisinvention when used in a talking machine is efiic-ient in reducing orpractically eliminating sharp, harsh hollow or other unpleasantqualities from the sound trans mitted giving a clear, brilliant andmellow quality to the production.

Where the harmony box is to be applied to talking machines during theirmanufacdescribed as the top may be the base board top wall of the motorcompartment of the talking machine cabinet with the other parts appliedthereto as here described.

Gf course I do not wish to be limited to the exact details ofconstruction as herein shown as these may be varied within the it hasbeen found that a limits of the appended claim without demidway itslength side walls at points approximately in aiineright seunding bitesii ony 2e05,

men-t with the inner ing, and iongiiudinai a beard in each camper whichare connected e f the end walls, the edg board diverging outwardwpel'tion of their length efiked my signaure.

